CP violation and the absence of second class currents in charmless B decays

Abstract

The absence of second class currents together with the assumption of factorization for non-leptonic B decays provide new constraints on CP observables in decay B to a0(980)(to eta pi) pi. The kinematics of this decay do not allow interference between the oppositely charged resonances in the Dalitz plot as in B0 to rho(770)pi. Nonetheless, under the assumption of factorization,the a0pi two-body time-dependent isospin analysis leads to a more robust extraction of the angle alpha than in the rhopi isospin-pentagon analysis. The absence of second class currents might lead to enhanced direct CP violation and/or allows for a test of some assumptions made in the alpha analysis in other decays like B to a0rho, B to b1(1235)pi, B to a0 a0, B to eta(eta')pipi and B to b1 a0. The effects from non-factorizable contributions on the determination of alpha are estimated by means of a numerical study.